Denture



March 17. 1925. r

' J. RUD ET AL DENTURE I Filed Ju1 '2s, 1923 part of this specification.

Patented Mar. 17, 1925.

UNITED STATE? 1,529,921 PATENT OFFICE.

JEAN ntrn, or sono'rnunn, AND CARL KERSCHBAUM, or znmom swrrznnrnnn.

neurons.

Application filed July 23,

To all whom it may concern:

Be it known that we, JEAN Rt'm, a citizen of the Republic ofSwitzerland, residing at Solothurn, Switzerland, and CARL KnRsoH- BAUM,a citizen of the Republic of Switzerland, residing at Hinwil, Ct.Zurich, Switzerland, have invented certain new and useful Improvementsin Dentures; and we do hereby declare the following to be a clear, full,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawingsyand to letters orfigures of reference marked thereon, which form a The present inventionrelates to improvements in dentures and has for its object to provide inan artificial denture or a set of artificial teeth a resilient orelastic packing at the necessary places between the set of teeth and itssupport, i. e. the roof of the mouth or the jaw respectively. Thispacking is an improvement over the known suction discs hitherto used forholding dentures in position.

Several constructional examples of the subject matter of the presentinvention are shown. In the drawing Fig. 1 shows in section and on anenlarged scale part of the denture, for instance the part of an upperset resting against the palate.

Fig. 2 is a section of a denture similar to that shown in Fig. 1, adiflerent packing strip being, however, provided.

F igs. 8, 4 and 5 are perspective views of dentures provided with apacking according to the present invention.

Referring now to the constructional example illustrated in Fig. 1, inthe plate body a. of the set a groove 2) is provided in which aninsertion 0 consisting of an elastic material, such as india-rubber, islodged. The portion of the insertion which is remote of the plate bearssnugly againstthe support cl (palate or jaw) and forms a packing betweenthe plate and the support which permits air or liquid to pass from leftto right when looking at the drawing, but prevents a passage in theopposite direction.

By means of this insertion portions of the denture of any shape can beoutlined and packed or tightened. The insertion is preferably formed asa strip. In most cases such a strip will be arranged along the circum-1923. Serial No. 653,318.

plate or denture itself is thesuction surface closely fitting the mucousmembrance, and the packing strip surrounds the effective portion of thesurface of. the plate. causing the adhesion of the plate to the mucousmem- I brane. The strip itself is not primarilythe means for causing theadhesion, the close fit of the plate does this, thestrip merely acts asa packing. This opposing force will be large owing to the comparativelylarge surface on which the pressure acts. If no outer force tending tocause a displacement is present and if the packing strip fits .well toits support the pressure below atmospheric disappears, it is no longerfelt by the bearer of the set of artificial teeth and does not give riseto irritations of the mucous membranes;

The recess 6 is. arranged on the plate of the set according torequirements,-for instance two recesses or grooves may be providedbeside each other sothat two packing or tightening strips 0 a, can bearranged to ensure a greater reliability, as is illustrated in Fig. 4,or two or more portions that are independent of each other and enclosedby packing strips can be formed. This ar-p rangement is shown in Fig. 5,in which three such portions 6, and g are enclosed by the packing strips0 0 and 0 respectively. It is, however, essential that the extent of thegroove corresponds to the requirements in I each case and that thetightened zone can be suitably shaped to lie snugly oirthe palate or thejaw.

In case of the generally used dentures of vulcanized india-rubber orvulcanite the groove can be obtained by inserting previous to thevulcanizing action an easily flexible metal strip it in the places wherethe groove has to be formed. The metal strip h (Fig. 2) is of arectangular'cross section enclosing a T-shaped groove 5. Into the latterthe beaded portion 7a of an india-rubber strip 0 is inserted, wherebythe latter is held in position. The outer surface of the metal strip ispreferably roughened as indicated in Fig. 2 by dotted lines, to ensurethat the strip is firmly embedded in the vulcanite mass. The. T-shapedgroove of the strip may be filled with a material that can be'removed bydipgroove 2.

ping the; vulcanized denture on which the stripshavebeen placed inposition before thus been removedthe rubber strip is inserted into thelatter by forcing the beaded portion 76 through the narrow gap Z of theThe metal strip; hzassvvell as the: 'rubber strip cv can be madeendlessto any suitable. lengthseor they'can be cut off ctronronepiece:tothealength required; in the latter caseicarezhasto; be takenthat the ends 50f :the

strip vjoin-well in order to produceetighten ing :zones which are:closed all "round, further the; ends; will be; arranged; at: such aplace: 7

roundingsaid surface; of raiilexibleypackingt strip; having an;enlarged-.5 edger;- fitting into: said; groove andiits opposite-edge;arranged i I to engage. theimucous membraneibeyondzasaidl surface andpreventing thementrance ofi air:

wheresleakageis notto bezexpectedr.

The inserted: packing. strip 01 can: be exr;

changed.

As'gthe inserted packing-strip ;requires lit-J tlerspacei'and asitsapplication isznot limited toga-space:ofaregula'r shapeto begtightened;it cambe adapted-mo any requirements and; I

it zisgwellwsuitedy therefore it for low and par tialjdenturesrr Weclaim: t

1.; packing; for: dentures comprising a, longitudinal flexible strip;having :a. denture:

engaging rbead at one;- edge, and a substan tiallyparallel edge;adaptedio lie against,

the? mucous membrane. p I

2; A; packing 'forfdentures, comprislng a strip of"fieXib1eaina-terialhaving; ax denture engaging bead along one edge and tapering to athin,jsubSt-antia1ly: parallelopposite Y edge; 7

3. A packing for dentures, ,,comprisingacontinuous groove surroundingthat portion fitting;the: membrane, a packing strip surrounding suchportlonand havlng one edge secured in said groovecandthezoppositefreeedge I tapered: arranged-1 engage; sai v membranes 5;.Thecmnbination.withzazidenturezhavingw a suction 1 surface; closelyfittingn theemueousa membrane and. a: continuous: groove sure betweensaid; surface and membrane CUES": membrane, aw, groove"; complete1y surrounding said surface, and r a. metal dining; for} said groove; io tiana,endless; flexible, soft Gar-The combination Wliih'ifindlllilllfl hakVT'ng a suctionasurface; closely htting'ztheemu:

rubber packing strip ,t having; agbead at one edge fitting into said.groove and- :a :taperedi substantially} parallel,- opposite.- edges to;fit: against said membranes t lna'testimony that we claimthe-rforegoing.

as our; invention, we have signed our names:

JEAN Run... i

,ARL KERSCHBAUM.,

